EDAC: Add owner check to the x86 platform drivers

Change x86 EDAC platform drivers to verify the module owner at the
beginning of their module init functions. This allows them to fail their
init immediately when ghes_edac is enabled. Similar change can be made
to other edac drivers if necessary.

Also, remove ".c" from module names of pnp2_edac, sb_edac, and skx_edac.

Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Suggested-by: Borislav Petkov <bp@alien8.de>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/20170823225447.15608-6-toshi.kani@hpe.com
Signed-off-by: Borislav Petkov <bp@suse.de>

4 files changed, 28 insertions, 4 deletions

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index ac2f30295efe..8b16ec595fa7 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -3434,9 +3434,14 @@ MODULE_DEVICE_TABLE(x86cpu, amd64_cpuids);
 
 static int __init amd64_edac_init(void)
 {
+	const char *owner;
 	int err = -ENODEV;
 	int i;
 
+	owner = edac_get_owner();
+	if (owner && strncmp(owner, EDAC_MOD_STR, sizeof(EDAC_MOD_STR)))
+		return -EBUSY;
+
 	if (!x86_match_cpu(amd64_cpuids))
 		return -ENODEV;
 
diff --git a/drivers/edac/pnd2_edac.c b/drivers/edac/pnd2_edac.c
index 4395c84cdcbf..df28b65358d2 100644
--- a/drivers/edac/pnd2_edac.c
+++ b/drivers/edac/pnd2_edac.c
@@ -45,6 +45,8 @@
 #include "edac_module.h"
 #include "pnd2_edac.h"
 
+#define EDAC_MOD_STR		"pnd2_edac"
+
 #define APL_NUM_CHANNELS	4
 #define DNV_NUM_CHANNELS	2
 #define DNV_MAX_DIMMS		2 /* Max DIMMs per channel */
@@ -1355,7 +1357,7 @@ static int pnd2_register_mci(struct mem_ctl_info **ppmci)
 	pvt = mci->pvt_info;
 	memset(pvt, 0, sizeof(*pvt));
 
-	mci->mod_name = "pnd2_edac.c";
+	mci->mod_name = EDAC_MOD_STR;
 	mci->dev_name = ops->name;
 	mci->ctl_name = "Pondicherry2";
 
@@ -1547,10 +1549,15 @@ MODULE_DEVICE_TABLE(x86cpu, pnd2_cpuids);
 static int __init pnd2_init(void)
 {
 	const struct x86_cpu_id *id;
+	const char *owner;
 	int rc;
 
 	edac_dbg(2, "\n");
 
+	owner = edac_get_owner();
+	if (owner && strncmp(owner, EDAC_MOD_STR, sizeof(EDAC_MOD_STR)))
+		return -EBUSY;
+
 	id = x86_match_cpu(pnd2_cpuids);
 	if (!id)
 		return -ENODEV;
diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c
index 2078ee414568..3ea90fc5978b 100644
--- a/drivers/edac/sb_edac.c
+++ b/drivers/edac/sb_edac.c
@@ -36,7 +36,7 @@ static LIST_HEAD(sbridge_edac_list);
  * Alter this version for the module when modifications are made
  */
 #define SBRIDGE_REVISION    " Ver: 1.1.2 "
-#define EDAC_MOD_STR      "sbridge_edac"
+#define EDAC_MOD_STR	    "sb_edac"
 
 /*
  * Debug macros
@@ -3155,7 +3155,7 @@ static int sbridge_register_mci(struct sbridge_dev *sbridge_dev, enum type type)
 		MEM_FLAG_DDR4 : MEM_FLAG_DDR3;
 	mci->edac_ctl_cap = EDAC_FLAG_NONE;
 	mci->edac_cap = EDAC_FLAG_NONE;
-	mci->mod_name = "sb_edac.c";
+	mci->mod_name = EDAC_MOD_STR;
 	mci->dev_name = pci_name(pdev);
 	mci->ctl_page_to_phys = NULL;
 
@@ -3407,10 +3407,15 @@ static void sbridge_remove(void)
 static int __init sbridge_init(void)
 {
 	const struct x86_cpu_id *id;
+	const char *owner;
 	int rc;
 
 	edac_dbg(2, "\n");
 
+	owner = edac_get_owner();
+	if (owner && strncmp(owner, EDAC_MOD_STR, sizeof(EDAC_MOD_STR)))
+		return -EBUSY;
+
 	id = x86_match_cpu(sbridge_cpuids);
 	if (!id)
 		return -ENODEV;
diff --git a/drivers/edac/skx_edac.c b/drivers/edac/skx_edac.c
index 3fe85b0ac274..e8e570e73796 100644
--- a/drivers/edac/skx_edac.c
+++ b/drivers/edac/skx_edac.c
@@ -31,6 +31,8 @@
 
 #include "edac_module.h"
 
+#define EDAC_MOD_STR    "skx_edac"
+
 /*
  * Debug macros
  */
@@ -473,7 +475,7 @@ static int skx_register_mci(struct skx_imc *imc)
 	mci->mtype_cap = MEM_FLAG_DDR4;
 	mci->edac_ctl_cap = EDAC_FLAG_NONE;
 	mci->edac_cap = EDAC_FLAG_NONE;
-	mci->mod_name = "skx_edac.c";
+	mci->mod_name = EDAC_MOD_STR;
 	mci->dev_name = pci_name(imc->chan[0].cdev);
 	mci->ctl_page_to_phys = NULL;
 
@@ -1044,12 +1046,17 @@ static int __init skx_init(void)
 {
 	const struct x86_cpu_id *id;
 	const struct munit *m;
+	const char *owner;
 	int rc = 0, i;
 	u8 mc = 0, src_id, node_id;
 	struct skx_dev *d;
 
 	edac_dbg(2, "\n");
 
+	owner = edac_get_owner();
+	if (owner && strncmp(owner, EDAC_MOD_STR, sizeof(EDAC_MOD_STR)))
+		return -EBUSY;
+
 	id = x86_match_cpu(skx_cpuids);
 	if (!id)
 		return -ENODEV;